Electronic device including earphone, and method of controlling the electronic device

1. An electronic device comprising: an earphone including a first impedance component; a signal generator configured to output a first alternating current (AC) signal; a first circuit including at least one first analog device having an impedance component electrically coupled to the first impedance component, and configured to receive the first AC signal and output a first detection signal including a voltage component corresponding to the first impedance component; and at least one processor configured to: generate at least one piece of biometric information, based on the first detection signal, and output the at least one piece of biometric information.

2. The electronic device of claim 1 , wherein the electronic device includes a shape in which the earphone is inserted into an external auditory meatus of a human being, and wherein a magnitude of the first impedance component varies according to a change in a pressure of the external auditory meatus.

3. The electronic device of claim 1 , wherein the at least one piece of biometric information comprises heart rate information, and wherein the at least one processor is further configured to generate the heart rate information, based on a phase component of the first detection signal.

4. The electronic device of claim 1 , wherein the at least one piece of biometric information comprises body temperature information, and wherein the at least one processor is further configured to generate the body temperature information, based on an amplitude component of the first detection signal.

5. The electronic device of claim 1 , wherein the first AC signal includes a frequency in an ultrasonic range.

6. The electronic device of claim 1 , wherein the first AC signal includes a frequency of 20 kHz to 40 kHz.

7. The electronic device of claim 1 , wherein the first circuit is configured to: generate the first detection signal including an in-phase signal of an in-phase component and an orthogonal signal of a quadrature phase component from the first AC signal and an intermediate detection signal of a node connected to the first analog device, and output the first detection signal to the at least one processor.

8. The electronic device of claim 7 , wherein the at least one processor is further configured to: generate body temperature information, based on a sum of a square of the in-phase signal and a square of the orthogonal signal, and generate heart rate information, based on phase information extracted from the in-phase signal and the orthogonal signal.

9. The electronic device of claim 1 , wherein the first circuit comprises a second impedance device, a third impedance device, and a fourth impedance device connected with the first impedance component in a bridge circuit structure, and is configured to: receive the first AC signal via at least one of a first node or a second node of the bridge circuit structure or a combination thereof, generate an in-phase signal of an in-phase component and an orthogonal signal of a quadrature phase component from an intermediate detection signal of a third node of the bridge circuit structure, and output the in-phase signal and the orthogonal signal to the at least one processor.

10. The electronic device of claim 9 , wherein two impedance devices directly connected to the first node have identical impedance values, and wherein two impedance devices directly connected to the second node have identical impedance values.

11. The electronic device of claim 9 , wherein the first node receives the first AC signal, wherein the second node receives a signal obtained by delaying a phase of the first AC signal by 180°, wherein the first impedance component is connected between a fourth node and the first node, and wherein the fourth node is connected to ground potential.

12. The electronic device of claim 9 , wherein the first node receives the first AC signal, wherein the second node is connected to ground potential, wherein the first impedance component is connected to between the second node and a fourth node, and wherein the first circuit is configured to differentially amplify a signal of the fourth node and a signal of the third node to generate the first detection signal.

13. The electronic device of claim 9 , wherein the first impedance component is connected to between the second node and a fourth node, wherein the second impedance device is connected to between the first node and the fourth node, the third impedance device is connected to between the first node and the third node, and the fourth impedance device is connected to between the second node and the third node, wherein the earphone includes a first resistance component and a first inductance component, wherein the second impedance device comprises a second resistor, the third impedance device comprises a third resistor and a third capacitor connected to the third resistor in parallel, and the fourth impedance device comprises a fourth resistor, wherein the first resistance component and a resistance component of the fourth resistor include same magnitudes, wherein the second resistor and the third resistor include resistance components of which magnitudes are same, and wherein the third capacitor includes a capacitor component of a magnitude {first inductance component/(resistance component of third resistor*resistance component of fourth resistor)}.

14. The electronic device of claim 9 , wherein the first impedance component is connected between the second node and a fourth node, wherein the second impedance device is connected between the first node and the fourth node, the third impedance device is connected between the first node and the third node, and the fourth impedance device is connected between the second node and the third node, wherein the first impedance component includes a first first resistance component and a first inductance component serially connected to each other between the second node and the fourth node, and a second first resistance component connected to the first first resistance component and the first inductance component in parallel between the second node and the fourth node, wherein the second impedance device comprises a second resistor, wherein the third impedance device comprises a third resistor and a third capacitor connected to each other in parallel between the first node and the third node, and wherein the fourth impedance device comprises a first fourth resistor, a second fourth resistor, and a fourth capacitor connected to one another in parallel between the second node and the third node.

15. The electronic device of claim 14 , wherein the first first resistance component and a resistance component of the first fourth resistor include same magnitudes, wherein the second resistor and the third resistor include resistance components of which magnitudes are same, wherein the second first resistance component and a resistance component of the second fourth resistor include same magnitudes, and wherein the third capacitor includes a capacitor component of a magnitude {first inductance component/(resistance component of third resistor*resistance component of first fourth resistor)}.

16. The electronic device of claim 1 , wherein the first circuit comprises a band pass filter and an envelope detector, and is configured to: generate a second intermediate detection signal by modulating a first intermediate detection signal of a node connected to the first analog device by using the band pass filter and the envelope detector, and generate the first detection signal including an amplitude change component signal and a direct current (DC) component signal generated from the second intermediate detection signal, and wherein the at least one processor is further configured to: generate heart rate information from the amplitude change component signal, and generate body temperature information from the DC component signal.

17. The electronic device of claim 1 , wherein the first circuit is configured to: receive an electrical audio signal corresponding to an audio signal output via the earphone, process the electrical audio signal by using a high pass filter, and apply a result of the processing to at least one node of the first circuit.

18. The electronic device of claim 1 , wherein the first circuit is configured to generate the first detection signal including an in-phase signal of an in-phase component and an orthogonal signal of a quadrature phase component from the first AC signal and an intermediate detection signal of a node connected to the first analog device, and wherein the at least one processor is further configured to: generate an amplitude signal of an amplitude component and a phase signal of a phase component from the in-phase signal and the orthogonal signal, and remove a motion component of the electronic device by using the amplitude signal and the phase signal.

19. The electronic device of claim 1 , wherein the first circuit is configured to generate the first detection signal including an in-phase signal of an in-phase component and an orthogonal signal of a quadrature phase component from the first AC signal and an intermediate detection signal of a node connected to the first analog device, and wherein the at least one processor is further configured to: generate an amplitude signal of an amplitude component and a phase signal of a phase component from the in-phase signal and the orthogonal signal, and detect attachment or detachment of the electronic device, based on a variation in at least one of the amplitude signal or the phase signal.

20. A method of controlling an electronic device comprising an earphone including a first impedance component, and a first circuit including at least one first analog device including an impedance component electrically coupled to the first impedance component, the method comprising: controlling a first AC signal to be output to the first circuit; obtaining a first detection signal including a voltage component corresponding to the first impedance component from the first circuit; generating at least one piece of biometric information, based on the first detection signal; and outputting the at least one piece of biometric information.